Head mechanism for shaking-tables.



C. I. GLASSBROOK. HEAD MEOHANISM FOR SHARING TABLES. APPLICATION FILED MAY 21, 1013.

1 1 20,304, Patented Dec. 8, 1914.

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G. I. GLASSBROOK.

HEAD MEUHANISM FOR SHAKING TABLES.

APPLICATION FILED MAY 21. 1013.

1 ,120,304. Patented Dec. 8, 1914.

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CLARENCE I. GLASSBROOK, 0F SALT LAKE CITY, UTAH.

HEAD MECHANISM FOR SHAKING-TABLES.

Specification of Letters Patent.

Patented Dec. 8, 1911.4.

Application filed May 21, 1913. Serial No. 769,000.

To all whom it may concern Be it known that I, CLARENCE I. GLASS- BROOK, a citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Head Mechanism for Shaking-Tables, of which. the following is a specification.

This invention relates to certain new and useful improvements in mechanism for operating machines having a part to be reciprocated, as for instance the shaking tables used for the concentration of ore and particularly ore having valuable constituents, as gold and silver, such machines being usually provided with mechanism for imparting to the table a vibratory motion for causing the ore particles to be advanced progressively over the table to a point of discharge.

A leading object of the present invention is to provide an improved means, hereinafter described and claimed, for imparting the operating and progressive action to the concentrating table, or for imparting a like movement to any shaking element, over which material is designed to pass and be separated.

A further object of the invention is to improve the character of the head-motion in shaking tables and particularly those designed for the concentration of ore, and in providing means for impartingto the table or part to be actuated, a movement that may be changed by adjustments, therein provided, from simple reciprocating motion to various degrees of progressive forward and backward speeds, the rate of speed being greatly accelerated from the beginning of the stroke and reaching its maximum velocity at the end of the forward stroke, the speed gradually diminishing and reaching its minimum velocity during the return stroke to the point of starting.

With the above and other objects in view, the present invention consists of the parts, and the constructions, arrangements and combinations of parts substantially as I will hereinafter describe and claim.

In the accompanying drawings forming part of this specification and in which similar reference characters indicate like parts in the several views, Figure 1 isa side elevation of an adjustable head-mechanism embodying my invention, one side of frame being removed. Figs. 2, 3, 1 and 5 are diagrams to which reference will be hereinafter made. Fig. (3 is a plan view of the wedge,

As the present invention relates entirely to the construction of the headancchanism for imparting the desired motions to the part to be reciprocated, whatever that part might be, 1 have omitted from the drawing all showing of such part and have limited the description and drawings to the head mechanism proper.

Upon a suitable bed or foundation, 10, is appropriately secured or mounted a cast frame or base, 11, upon which suitable pedestals, 12, are secured, said pedestals being adapted to support in appropriate journal boxes, the ends of a crank-shaft, 13, said shaft having secured to it a pitman, C, the outer end of which is pivotally connected by a pin, 1), to a cam, E, whose upper end is pivotally mounted upon a pin or stud, F, appropriately secured in the main frame, which main frame comprises the aforesaid base and pedestals and further includes similar horizontal projecting hangers, A, one of which is shown in Fig. l and which hangers are adapted to support the vertically disposed stroke-adjusting rocker, 0, whose upper end is appropriately hung upon the pin, Q, in the outer end of the hangers. From this construction it will be apparent that the pitman, C, forms the connection between the crank shaft, 13, and the cam, E, which is adapted to oscillate about the pin or stud, F, said cam having a curved face as shown in Fig. l. j

The oscillating cam, E, operates in conjunction with a second or lower cam, G, having an upper curved face and barring a lower portion, J, which is connected to the lower end of the vertically adjusting rocker, O, by means of the link, M, said link having one end pivotally mounted on the pin or stud, N, and having the opposite end like wise mounted on the pin or stud, K, which operates in a slot. L, formed in the lower portion, J, of the lower cam, the connection being such as to cause the lower end of the rocker, O, to be moved backward and forward to impart to the table or part to be reciprocated, the reciprocating and differential motion of the cam, G.

In order that the head mechanism herein shown and described may be operatively connected to the concentrating or other table or part to be reciprocated, and more particularly that I may form an adjustable con: nection between the head mechanism and the table and thereby control or adjust the stroke of said mechanism, I prefer to em ploy a construction substantially as follows shown in Fig. 1, to which a nut, 31, is en- 1 gaged and by means of which the attachment, 27, may be securely locked to the aforesaid rocker, O,whichrocker is in prac-' tice provided with a longitudinal central slot to accommodate between the walls thereof the movable attachment. tachment is also provided with a steel pin, 33, to which is attached a connecting rod, 34, leading to a concentrating or other shaking table, not shown, said rod being the medium by which the reciprocating motion is transmitted from the head-mechanism to said table.

Owing to the attachment, 27, being provided with the lug, 29, in which is mounted the screw, 28, it is quite evident that said attachment may be moved up and down and fastened at any point on the rocker, 0, between a position which is substantially close to the lower bearing pin, N, which is the point of greatest motion to a position near the upper bearing pin, Q, which may repre-' sent the point of least motion, and by this adjustment I am enabled to impart to the table, or part to be reciprocated, any degree of. stroke or reciprocating motion desired and within the range of maximum and mini mum movement produced by the rocker, 0, when it is actuated by the crank and cam mechanism 7 before mentioned.

It will be observed that the lower cam, G, has at its intermediate portion, a pivot pin, I, which is mounted in suitable bearing boxes, H, one of which is shown in Fig. 1, these boxes being designed for vertical sliding movement in a vertical guide formed between the posts or flanges, X, with which the main frame is provided, each of said bearing-boxes for thepivot pin of the lower cam being mounted on an appropriate wedge, S, horizontally disposed and slidably mounted upon the main frame and having a back portion, S, in which is mounted a horizontal screw, T, carried in a bracket, IV, bolted or otherwise secured to the main frame. By means of this screw and wedge .may be moved in and out in a horizontal plane and be securely held in its adjusted position. plex in character, there being a wedge portion similar to what is shown in Fig. l,.on each side of the cam, G, said wedge portions being connected together at their rear ends The at-.

The wedge, S, is in practice duby a solid piece of metal forming the back,

S, into which is inserted the horizontal screw, T, before mentioned. 7

The under face of the wedge has for its permanent bearing the main frame and its upper inclined surface engages under the" bearing-boxes, H, to progressively adjust the position of these boxes and of the cam, G, and associated parts as the wedges are moved in and out through the manipulation of the adjusting screw, "I. The purpose of this arrangement is to enable the operator to increase or diminish the amount of variable travel of the lower cam, G. For instance, advancing the wedges under the bearings, H, will result in the cam, G, being raised to increase the range of contact and to bring the extreme points of the cams nearer to the pivot pins, I and F, and correspondingly increase the difference in the distance traveled at the opposite points of reverse. 7

In addition to the foregoing I have shown in Fig. l, a spring, R, which is placed under suitable tension by means of the screw, V, mounted in the lower projecting portion of the rocker, 0, whereby all of the working parts of the machine are held in proper operating contact. The contact faces of the cams, E and G, have the same radial curves; this gives a rolling contact that produces a minimum of friction, consequently very little wear from the sliding of one face against the other occurs during the change of positions. l

The main purpose of this invention being to provide for variable action of the forward and backward reverse stroke that is imparted to the lower cam, G, and through its connections to the part to be reciprocated, and this variable action being due to the varying points of contact of the cams, E and G, when in action, I will now refer to the diagrammatic showing of Figs. 2, 3, l and 5, to illustrate the operation of the parts. hen the crank, B, is passing points, 8, l and 2, indicated on the circle of the crank travel (Fig. 2). the cam, E, by reason of its pitman connection at the arc-line, D, will have traveled from the curved line 82 to 1, and returned to 82; in passing from point 2 to 3 on-the crank circle, the cam reaches its central position, not shown. From the point 3 to 4: on the crank circle we reach the curved line of the cam, marked 6- l, thence the crank in passing from points 4 to 5 and 6, on the crank circle, making the reverse stroke to compare with th first movement of the crank from 8, l 2, we find that the space traveled by the cam, E, is approximately equal at both extremes of travel; we also find that the travel of the cam, G, (Fig. 4:), is very unequal, in fact, the distance traveled by the cam, G, during the passage of the crank from points 4, 5 and 6, is approximately six times greater than the distance traveled during the passage of the crank through the points 8-l2--1. The ffect of this variable speed at the reverse points of crank travel as produced by changing pointsof cam-contacts is, when applied to ores or other matter upon the surface a of a shaking table, or similar device, to progress the particles in the direction of the table movement corresponding to the equal forward and return movement of the cam, G, as indicated by the curved lines 4, 5 and 6. This amount of variable travel of accelerated motion of the cam, G, may be increased or diminished at Will by the operator adjusting the position of the wedges and by so doing changing the position of contact of the cams. In other words, advancing the wedge under the bearing, H, raises the cam, G, and increases the lap or range of contact and brings the extreme points of the cams nearer to the pivot pins, I and F, and correspondingly increases the difference in the distance traveled at the opposite points of reverse; that is to say, that the distance between the curved lincs1-82, will be decreased and the distance between the curved lines, -11, 6 and 5, will be increased at the point of cam-contact, correspondingly (see Figs. 2, 3, 4i and and this divergence of action can be varied from a motion that is simply reciprocating to the extreme acceleration or differential within the range of the mechanism employed.

From the foregoing it will be understood that I have produced an actuating mechanism adapted to impart to a table or other part to be actuated a movement that may be changed by adjustments from simple reciprocating to various degrees of progressive forward and backward speeds, the arts of speeds being greatly accelerated from the beginning of the stroke, and reaching its maximum velocity at the end of the forward stroke, gradually diminishing, and reach its minimum velocity during the return stroke to the point of starting, the change from one movement to the other depending upon the position of contact or relative position which the two cams may bet r to each other by reason of the position in which the reciproeating cam may be adjusted.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. The combination with a part to be re ciprecated and an actuating crank and pitman therefor, of means interposed between said pitman and thepart to be reciprocated for converting a simple reciprocation of said part to various degrees of progressive forward and backward speeds, said means comprising a pair of members having reversely curved contact surfaces, and means for ad- 'nstin one of said members in the direction of its length relatively to the other member for changing the point of contact of said members.

2. The combination with a part to be reciprocated and an actuating crank and pitman therefor, of means interposed between said pitman and the part to be reciprocated for changing a simple reciprocation of said part to various degrees of progressive forward and backward speeds, said means comprising a pair of oscillating members having reversely curved contacting surfaces, and means for adjusting one of said members in a lengthwise direction relativel to the other member and thereby changing the point of contact of the convex surfaces of said members.

3. The combination with a part to be reciprocatcd and an actuating crank and pitman therefor, of means interposed between said pitman and the part to be reciprocated for changing a simple reciprocation of said part to various degrees of progressive forward and backward speeds, said means including a pair of oscillating cams having convex faces in contact, said convex faces having a bearing substantially the full length of the lap of the faces, means for holding the cams in contact with each other, and means for adjusting one of the cams in a lengthwise direction relatively to the other cam and thereby changing the point of contact on the convex surfaces of the cams.

4.. The combination with a part to be reciprocated and an actuating crank and pitman therefor, of means interposed between said pitman and the part to be reciprocated for changing a simple reciprocation of said part to various degrees of progressive forward and backward speeds, said means including a pair of pivotally-moiilnted oscillating cams having curved contacting faces, said faces forming a contact bearing substantially the full length of the lap of the faces, means for connecting one of said cams to the part to be reciprocated, means for exerting a pressure on one of said cams for holding the same in contact with the other cam, and means for adjusting one of said cams relatively to the other and thereby changing the point of contact of the cams.

The combination with a part to be reciprocated and an actuating crank and pitman therefor, of means interposed between said pitman and the part to be reciprocated for changing a simple reciprocation of said part to various degrees of progressive forward and backward speeds, the rate of speed being gradually accelerated from the. beginning of the stroke and reaching its greatest velocity at the end of the forward stroke and gradually diminishing and reaching its minimum velocity during the return stroke to point of starting, said means including a pair of relatively-reversed oscillatory-cams, each of said cams having a convex face and said faces formmg a contact bearing substantially the full length of the lap of the faces, connections between one of said cams and the part to be reciprocated, a pressure member operating upon said connections to hold the faces of the cams in contact, and means for longitudinally adjusting one of the cams relatively to the other and thereby changing the point of contact of said cams.

6. The combination with a part to be reciprocated and an actuating crank and pitman therefor, a rocker, and means connecting the same to the part to be reciprocated, of a cam mechanism between the pitman and the rocker, said mechanism comprising a pair of relatively-reversed oscillatorycams having contact faces in rolling contact, said convex faces forming a contact bearing substantially the full length of the lap of the faces, means connecting one of said cams with the rocker, and means for longitudinally adjusting said last-named cam relatively to the companion cam and thereby changing the point of contact of the cams and relative position which the two cams may bear to each other, whereby the movement of the part to be reciprocated may be changed from simple reciprocating to various degrees of progressive forward and backward speeds.

7. The combination with a part to be reciprocated and an actuating crank and pitman therefor, a rocker, and means connecting the same to the part to be reciprocated, of a cam mechanism between the pitman and the rocker, said mechanism comprising a pair of relatively-reversed oscillatorycams ha *ing contact faces in rolling contact, said convex faces forming a contact bearing substantially the full length of the lap of the faces, means connecting one of said cams with the rocker, and means for longitudinally adjusting said last-named cam relatively to the companion cam and thereby changing the point of contact of the cams and relative position which the two cams may bear to each other, whereby the movement of the part to be reciprocated may be changed from simple reciprocating to various degrees of progressive, forward and backward speeds, the rate of speed being gradually accelerated from the beginning of the stroke, and reaching its greatest velocity at the end of the forward stroke, and gradually diminishing and reaching its minimum velocity during the return stroke at the point of starting.

V 8. An actuating mechanism of the character described, comprising a rotary member; a connecting pitman; 'a pivoted cam con- .nected to said pitman and adapted to be oscillated thereby; a second cam, in engagement with the first cam, and mounted for oscillation; each of said cams having a c0nveX face and said faces forming a'contact bearing substantially the full length of the faces, a rocker; means connecting the same to a part to be reciprocated; a connectionbetween the rocker and the second-named cam; means for adjusting the second-named cam relatively to the first-named cam and changing the point of contact of said cams and thereby imparting a reciprocating and differential stroke to the part to be reciprocated, said cams having contacting faces of substantially like radial curvature, and pressure means acting upon the secondnamed cam for holding the faces of the cams in rolling contact.

9. An actuating mechanism of the character described, comprising a rotary member; a connecting pitman; a pivotally mounted cam connected to said pitman and having a curved face; a second cam pivotally mounted and having a curved face maintained in rolling contact with the face of the first cam; said faces forming a contact bearing substantially the full length of the faces; pressure means for holding said faces in contact; a rocker connected to the secondnamed cam and adapted 'to be connected to a part to be reciprocated; and means for adjusting the second-named cam to vary its point of contact with the first-named cam and thereby varying the stroke of said rocker.

10. An actuating mechanism of the character described, comprising a rotary member; a connecting pitman; a pivotally mounted cam connected to said pitman and having a curved face; a second cam pivotally mounted and having a curved face maintained in rolling contact with the face of the first cam; said faces forming a contact bearing substantially the full length of the faces; pressure means for holding said faces in contact; a rocker connected to the second-named cam and adapted to be connected to a part to be reciprocated; and means for adjusting the second-named cam to vary its point of contact with the firstnamed cam and thereby varying the stroke of said rocker, said last means comprising an adjustable member of wedge-like form operating in engagement with the secondnamed cam and lengthwise adjusting the latter whereby the range of contact of said cam with the first-named cam may be varied.

11. An actuating mechanism of the character described, comprising an oscillating cam, a second oscillating cam, said cams being relatively reversed and forming a con tact bearing substantially the full length of their faces and having curved faces in rolling contact, means for lengthwise adjusting one cam relatively to the other, means for sustaining the position of the second-named cam in its relation of contact with the firstnamed cam, a rocker adapted to be connccted to a part to be reciprocated, means for connecting said rocker to the second named cam, and means for positively operating one of said cams.

12. The combination with a part to be reciprocated and an actuating crank and pitman therefor, of means between said pitman and part to be reciprocated for changing a simple reciprocation of said part to various degrees of progressive forward and backward speeds, the rate of speed being gradually accelerated from the beginning of the stroke and reaching its greatest velocity dimple: of thin patent may be obtained for five cents each, by

at the end of the forward stroke, and gradually diminishing and reaching its minimum velocity during the return stroke at the point of starting, said means including a pair of co-acting oscillating cams having convex surfaces forming a contact bearing throughout substantially the full length of the lap of said surfaces, and means for adjusting one 01 the cams in a lengthwise direction relatively to the other cam and:

thereby changing the point of contact on the surfaces of the cams.

In testimony whereof I ai'fix my signature in presence of two witnesses.

CLARENCE I. GLASSBROOK. Witnesses:

M. S. WooLLnY, Ron'r. S. NORTHROP.

addressing the Commissioner of Patents,

Washington, D. G." 

